#include <G4PreCompoundAlpha.hh>
Inheritance diagram for G4PreCompoundAlpha:
Public Member Functions | |
G4PreCompoundAlpha () | |
virtual | ~G4PreCompoundAlpha () |
Protected Member Functions | |
virtual G4double | GetRj (G4int NumberParticles, G4int NumberCharged) |
virtual G4double | CrossSection (G4double ekin) |
virtual G4double | FactorialFactor (G4int N, G4int P) |
virtual G4double | CoalescenceFactor (G4int A) |
virtual G4double | GetAlpha () |
G4double | GetOpt12 (G4double K) |
G4double | GetOpt34 (G4double K) |
Definition at line 42 of file G4PreCompoundAlpha.hh.
G4PreCompoundAlpha::G4PreCompoundAlpha | ( | ) |
Definition at line 47 of file G4PreCompoundAlpha.cc.
References G4VPreCompoundFragment::GetA(), G4VPreCompoundFragment::GetRestA(), G4VPreCompoundFragment::GetRestZ(), G4VPreCompoundFragment::GetZ(), and G4VPreCompoundFragment::ResidualA13().
00048 : G4PreCompoundIon(G4Alpha::Alpha(), &theAlphaCoulombBarrier) 00049 { 00050 ResidualA = GetRestA(); 00051 ResidualZ = GetRestZ(); 00052 theA = GetA(); 00053 theZ = GetZ(); 00054 ResidualAthrd = ResidualA13(); 00055 FragmentAthrd = ResidualAthrd; 00056 FragmentA = theA + ResidualA; 00057 }
G4PreCompoundAlpha::~G4PreCompoundAlpha | ( | ) | [virtual] |
Implements G4PreCompoundIon.
Definition at line 67 of file G4PreCompoundAlpha.cc.
00068 { 00069 return 4096.0/G4double(A*A*A); 00070 }
Implements G4PreCompoundIon.
Definition at line 90 of file G4PreCompoundAlpha.cc.
References G4endl, G4VPreCompoundFragment::g4pow, G4VPreCompoundFragment::GetA(), G4PreCompoundIon::GetOpt0(), GetOpt12(), GetOpt34(), G4VPreCompoundFragment::GetRestA(), G4VPreCompoundFragment::GetRestZ(), G4VPreCompoundFragment::GetZ(), G4VPreCompoundFragment::OPTxs, G4VPreCompoundFragment::ResidualA13(), and G4Pow::Z13().
00091 { 00092 ResidualA = GetRestA(); 00093 ResidualZ = GetRestZ(); 00094 theA = GetA(); 00095 theZ = GetZ(); 00096 ResidualAthrd = ResidualA13(); 00097 FragmentA = theA + ResidualA; 00098 FragmentAthrd = g4pow->Z13(FragmentA); 00099 00100 if (OPTxs==0) { return GetOpt0( K); } 00101 else if( OPTxs==1 || OPTxs==2) { return GetOpt12( K); } 00102 else if (OPTxs==3 || OPTxs==4) { return GetOpt34( K); } 00103 else{ 00104 std::ostringstream errOs; 00105 errOs << "BAD Alpha CROSS SECTION OPTION !!" <<G4endl; 00106 throw G4HadronicException(__FILE__, __LINE__, errOs.str()); 00107 return 0.; 00108 } 00109 }
Implements G4PreCompoundIon.
Definition at line 62 of file G4PreCompoundAlpha.cc.
00063 { 00064 return G4double((N-4)*(P-3)*(N-3)*(P-2)*(N-2)*(P-1)*(N-1)*P)/12.0; 00065 }
G4double G4PreCompoundAlpha::GetAlpha | ( | ) | [protected, virtual] |
Implements G4PreCompoundIon.
Definition at line 111 of file G4PreCompoundAlpha.cc.
00112 { 00113 G4double C = 0.0; 00114 G4int aZ = theZ + ResidualZ; 00115 if (aZ <= 30) 00116 { 00117 C = 0.10; 00118 } 00119 else if (aZ <= 50) 00120 { 00121 C = 0.1 - (aZ-30)*0.001; 00122 } 00123 else if (aZ < 70) 00124 { 00125 C = 0.08 - (aZ-50)*0.001; 00126 } 00127 else 00128 { 00129 C = 0.06; 00130 } 00131 return 1.0+C; 00132 }
Definition at line 138 of file G4PreCompoundAlpha.cc.
References G4VPreCompoundFragment::g4pow, and G4Pow::powZ().
Referenced by CrossSection().
00139 { 00140 G4double Kc=K; 00141 00142 // JMQ xsec is set constant above limit of validity 00143 if (K > 50*MeV) { Kc = 50*MeV; } 00144 00145 G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs; 00146 00147 G4double p0 = 10.95; 00148 G4double p1 = -85.2; 00149 G4double p2 = 1146.; 00150 G4double landa0 = 0.0643; 00151 G4double landa1 = -13.96; 00152 G4double mm0 = 781.2; 00153 G4double mu1 = 0.29; 00154 G4double nu0 = -304.7; 00155 G4double nu1 = -470.0; 00156 G4double nu2 = -8.580; 00157 G4double delta=1.2; 00158 00159 Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta); 00160 p = p0 + p1/Ec + p2/(Ec*Ec); 00161 landa = landa0*ResidualA + landa1; 00162 G4double resmu1 = g4pow->powZ(ResidualA,mu1); 00163 mu = mm0*resmu1; 00164 nu = resmu1*(nu0 + nu1*Ec + nu2*(Ec*Ec)); 00165 q = landa - nu/(Ec*Ec) - 2*p*Ec; 00166 r = mu + 2*nu/Ec + p*(Ec*Ec); 00167 00168 ji=std::max(Kc,Ec); 00169 if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;} 00170 else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;} 00171 00172 if (xs <0.0) {xs=0.0;} 00173 00174 return xs; 00175 }
Definition at line 178 of file G4PreCompoundAlpha.cc.
References G4VPreCompoundFragment::g4pow, and G4Pow::powZ().
Referenced by CrossSection().
00180 { 00181 G4double landa, mu, nu, p , signor(1.),sig; 00182 G4double ec,ecsq,xnulam,etest(0.),a; 00183 G4double b,ecut,cut,ecut2,geom,elab; 00184 00185 G4double flow = 1.e-18; 00186 G4double spill= 1.e+18; 00187 00188 G4double p0 = 10.95; 00189 G4double p1 = -85.2; 00190 G4double p2 = 1146.; 00191 G4double landa0 = 0.0643; 00192 G4double landa1 = -13.96; 00193 G4double mm0 = 781.2; 00194 G4double mu1 = 0.29; 00195 G4double nu0 = -304.7; 00196 G4double nu1 = -470.0; 00197 G4double nu2 = -8.580; 00198 00199 G4double ra=1.20; 00200 00201 //JMQ 13/02/09 increase of reduced radius to lower the barrier 00202 // ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra); 00203 ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra); 00204 ecsq = ec * ec; 00205 p = p0 + p1/ec + p2/ecsq; 00206 landa = landa0*ResidualA + landa1; 00207 a = g4pow->powZ(ResidualA,mu1); 00208 mu = mm0 * a; 00209 nu = a* (nu0+nu1*ec+nu2*ecsq); 00210 xnulam = nu / landa; 00211 if (xnulam > spill) { xnulam=0.; } 00212 if (xnulam >= flow) { etest = 1.2 *std::sqrt(xnulam); } 00213 00214 a = -2.*p*ec + landa - nu/ecsq; 00215 b = p*ecsq + mu + 2.*nu/ec; 00216 ecut = 0.; 00217 cut = a*a - 4.*p*b; 00218 if (cut > 0.) { ecut = std::sqrt(cut); } 00219 ecut = (ecut-a) / (p+p); 00220 ecut2 = ecut; 00221 //JMQ 290310 for avoiding unphysical increase below minimum (at ecut) 00222 // ecut<0 means that there is no cut with energy axis, i.e. xs is set 00223 // to 0 bellow minimum 00224 // if (cut < 0.) ecut2 = ecut - 2.; 00225 if (cut < 0.) { ecut2 = ecut; } 00226 elab = K * FragmentA / G4double(ResidualA); 00227 sig = 0.; 00228 00229 if (elab <= ec) { //start for E<Ec 00230 if (elab > ecut2) { sig = (p*elab*elab+a*elab+b) * signor; } 00231 } //end for E<Ec 00232 else { //start for E>Ec 00233 sig = (landa*elab+mu+nu/elab) * signor; 00234 geom = 0.; 00235 if (xnulam < flow || elab < etest) { return sig; } 00236 geom = std::sqrt(theA*K); 00237 geom = 1.23*ResidualAthrd + ra + 4.573/geom; 00238 geom = 31.416 * geom * geom; 00239 sig = std::max(geom,sig); 00240 } //end for E>Ec 00241 return sig; 00242 }
G4double G4PreCompoundAlpha::GetRj | ( | G4int | NumberParticles, | |
G4int | NumberCharged | |||
) | [protected, virtual] |
Implements G4PreCompoundIon.
Definition at line 72 of file G4PreCompoundAlpha.cc.
00073 { 00074 G4double rj = 0.0; 00075 if(nCharged >=2 && (nParticles-nCharged) >=2 ) { 00076 G4double denominator = 00077 G4double(nParticles*(nParticles-1)*(nParticles-2)*(nParticles-3)); 00078 rj = 6.0*nCharged*(nCharged-1)*(nParticles-nCharged)*(nParticles-nCharged-1) 00079 /denominator; 00080 } 00081 return rj; 00082 }